Method of forming skid-proof leather-texture surface on metallic substrate

Abstract

A method of forming a skid-proof leather-texture surface on a metallic substrate, including the following steps of: providing a metallic substrate; performing a first pretreatment to clean the surface of the metallic substrate; etching the surface of the metallic substrate through an etchant while using a etch-moderating agent to moderate the condition of etching. performing a second pretreatment, such as pickling or chemical polishing, on the surface of the metallic substrate; performing an anodic treatment on the surface of the metallic substrate to form an oxidized film having micro-porous structure thereon; activating the surface of the metallic substrate after the anodic treatment; dyeing the surface of the metallic substrate; sealing the micro-porous structure formed on the surface of the metallic substrate; and ash-removing to clean the metallic substrate.

What is claimed is: 
     
         1 . A method of forming a skid-proof leather-texture surface on a metallic substrate, comprising the following steps of:
 providing a metallic substrate,   performing a first pretreatment to clean the surface of the metallic substrate;   etching the surface of the metallic substrate through an etchant while using an etch-moderating agent to moderate the condition of etching;   performing a second pretreatment on the surface of the metallic substrate;   performing an anodic treatment on the surface of the metallic substrate to form an oxidized film having micro-porous structure thereon;   activating the surface of the metallic substrate after the anodic treatment;   dyeing the surface of the metallic substrate;   sealing the micro-porous structure formed on the surface of the metallic substrate; and   ash-removing to clean the metallic substrate.   
     
     
         2 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the step of performing the first pretreatment on the metallic substrate includes a sub-procedure of degreasing and water rinsing on the surface of the metallic substrate. 
     
     
         3 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the etchant consist of at least one solution containing transitional metal salt, and wherein the etch-moderating agent is a long-chain surface-active agent. 
     
     
         4 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 3 , wherein the etchant contains at least one metallic salt solution selected from the group consisting of metal, copper and nickel salt; and wherein the etch-moderating agent contains at least one long-chain surface-active agent selected from the group consisting of anion, cation, and non-ionic long-chain surface-active agents. 
     
     
         5 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 3 , wherein the metallic substrate is an aluminum alloy substrate, and wherein the etchant consists of 3.2 g/L of ferric chloride and 0.6 g/L of copper sulphate under a temperature of 40±5 degrees, wherein the etch-moderating agent includes sodium dodecylbenzenesulfonate of 50 PPM. 
     
     
         6 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the process of performing the second pretreatment on the surface of the metallic substrate includes a pickling and a chemical polishing process to produce a foggy surface on the metallic substrate. 
     
     
         7 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 6 , wherein the pickling process uses a nitric acid solution of 5 ml/L under a temperature of 25 degrees. 
     
     
         8 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 6 , wherein the chemical polishing process uses a phosphoric acid of 85% at a temperature which ranges from 90 to 93 degrees for 1 to 10 seconds. 
     
     
         9 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 8 , wherein the gloss of the chemical polishing process is smaller than 6. 
     
     
         10 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the anodic treatment includes dipping the substrate into a sulfuric acid having a concentration that ranges from 20 wt % to 25 wt %, where the temperature ranges from 15 to 25 degrees, the current density is 1.4 A/m 2 , and the processing time last for at least 30 minutes. 
     
     
         11 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the activation of the metallic substrate includes dipping the substrate into a nitric acid of 20 ml/L at a temperature of 25±5 degrees. 
     
     
         12 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the dyeing step utilizes a aluminum alloy dye to dye the metallic substrate under a temperature that ranges from 5 to 50 degrees for 0.1 to 10 minutes. 
     
     
         13 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the sealing step includes dipping the aluminum alloy substrate into a nickel acetate sealing agent having a concentration of 7 g/L under a temperature that ranges from 90±5 degrees for 30 minutes. 
     
     
         14 . The method of forming a skid-proof leather-texture surface on a metallic substrate according to  claim 1 , wherein the ash-removing step includes the utilizing a nitric acid of 20 ml/L under a temperature that ranges from 20±5 degrees.